Local laws might vary, but I think one essential question would be - is the 3D model created with a photograph of the person?
If no:
Most likely there is absolutely nothing they can do about it. Creating a 3D character from scratch is the same as drawing a caricature or chiseling a sculpture, the result is your own and nobody elses. Especially if the reproduction is not very accurate.
If yes:
Depends on local laws. But even in the EU which is very strict about privacy, people of public interest do not enjoy the same priviledge like regular people, which is being able to sue everyone taking a picture of them (or using pictures in unagreed ways). Just imagine every photomontage of Angela Merkel in an SS Uniform would be prosecuted.
Either way, if you have reason to believe that the 3D model is created from a photograph, then you probably shouldn't use it. Even though the products in the DAZ stores are not being taken down despite being virtual plagiarism (like Emma Watson being called Emmeline and such).
Another very big misconception seems to be the nature of "Adult Games" compared to commercial video games. You compare this with video games that are being advertised in a billion dollar business, while something on Patreon might have merely a few hundred "donators". To begin with, there would have to be a hearing to decide wether a Patreon game is actually a commercial product, or just artwork receiving voluntary donations.
Any celeb with a decent PR Manager will know better than publicly acknowledging the mere existence of these games, because this would bring too much unwanted attention to something they shouldn't even be aware of.
What Patreon would do if the celeb would send a friendly email with a takedown request, that is another question. I don't know their stance on that matter, but I have no doubts that they could change this at a moment's notice.
Though as long as you would only host the game on F95zone, the chance for it to be removed from the site is practically zero (as long as forum rules are respected).